US11597143B2 - Additive manufacturing process using fusing and non-fusing printing fluids - Google Patents
Additive manufacturing process using fusing and non-fusing printing fluids Download PDFInfo
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- US11597143B2 US11597143B2 US16/075,878 US201716075878A US11597143B2 US 11597143 B2 US11597143 B2 US 11597143B2 US 201716075878 A US201716075878 A US 201716075878A US 11597143 B2 US11597143 B2 US 11597143B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/40—Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- Additive manufacturing processes are often used to fabricate objects including three-dimensional objects.
- a computer controls the spreading of powder and jetting of printing fluid to form successive layers of material according to a digital model of an object.
- the printing fluid may contain a fusing agent that causes the powder to fuse under certain conditions, such as exposure to energy.
- a three-dimensional object is formed.
- Such processes may be used to fabricate a variety of three-dimensional objects, including functional and aesthetic machine components, consumer and industrial products that are produced in short runs (e.g., less than one thousand units), and customized high-value-products that may be one-of-a-kind.
- FIG. 1 illustrates a block diagram of a top view of an example system of the present disclosure
- FIG. 2 illustrates a flowchart of an example method for fabricating an object via an additive manufacturing process
- FIG. 3 A illustrates a first example slice image of an object to be fabricated via an additive manufacturing process
- FIG. 3 B illustrates a second example slice image of the object of FIG. 3 A ;
- FIG. 3 C illustrates an example ink distribution map corresponding to the second example slice image of FIG. 3 B ;
- FIG. 4 A illustrates an example slice image 400 for use in fabricating a plurality of objects
- FIG. 5 depicts a high-level block diagram of an example computer that can be transformed into a machine capable of performing the functions described herein.
- the present disclosure broadly describes an apparatus, method, and non-transitory computer-readable medium for additive manufacturing using fusing and non-fusing printing fluids (or using binding and non-binding printing fluids, where the additive manufacturing process comprises a binder jetting process).
- additive manufacturing processes may be used to fabricate a variety of objects (e.g., three-dimensional, two-dimensional, and 2.5 dimensional objects including surface finishings or coatings), including functional and aesthetic machine components, consumer and industrial products that are produced in short runs (e.g., less than one thousand units), and customized high-value products that may be one-of-a-kind.
- the design information e.g., geometry, color, etc.
- for some of these items may be considered proprietary.
- intellectual property, personal information, or even sensitive military data can be extracted in some cases simply from the design information, which may be exposed during the manufacturing process due to the configuration of the manufacturing hardware (e.g., as in the case where the build bed of the additive manufacturing system is open for viewing).
- an unauthorized individual may be able to reverse engineer all or part of an object by recording the manufacturing process, or even just by catching a glimpse of the object during manufacturing.
- Examples of the present disclosure use a combination of fusing and non-fusing printing fluids (e.g., inks) to disguise at least some of the design information about an object being fabricated via an additive manufacturing process.
- a model e.g., one or more slice images
- the regions of the model defining the object to be fabricated are subsequently fabricated using the fusing printing fluids, while the regions of the model defining the sacrificial artifact are fabricated using the non-fusing printing fluids.
- the fusing and non-fusing printing fluids are the same color
- the sacrificial artifact comprises an artifact that directly touches and at least partially encloses the object to be fabricated.
- the sacrificial artifact obscures the exact shape and dimensions of the object to be fabricated during the manufacturing process, but does not fuse or bind to the object upon completion of the manufacturing process.
- non-fusing printing fluids do not interfere with fabrication of the object or alter the final fabricated product.
- the manufacturing time is not extended, and additional manufacturing cost is therefore minimized.
- Examples of the present disclosure can also be extended in all three dimensions.
- examples of the present disclosure describe an additive manufacturing process based on slice images that are reconstructed in the x and z dimensions of the three-dimensional coordinate plane
- entire disguised images can also be fabricated along the y axis (i.e., in the build direction). That is, the geometry of the object being fabricated can also be disguised in the y dimension using non-fusing printing fluids to generate sacrificial artifacts.
- any references to “fusing” printing fluids could be applicable to “binding” printing fluids as well, and any references to “non-fusing” printing fluids could also be applicable to “non-binding” printing fluids.
- the image processing system 102 comprises a computing device (e.g., a general purpose computing device or a special purpose computing device) that stores a model of an object to be fabricated.
- the object is fabricated by the print engine 104 in a series of layers that are fused together.
- the model of the object may comprises a plurality of cross sections or slice images that are reproduced by the print engine 104 in printing fluid, where each slice image corresponds to one or more of the layers of the object.
- the image processing system may or may not include an application for generating and/or modifying the model.
- the image processing system 102 sends electronic signals to the print engine 104 . These electronic signals, in turn, drive the components of the print engine 104 (discussed in further detail below) to cooperate to fabricate the object.
- the image processing system 102 is illustrated as being external or separate from the print engine 104 , some image processing system functions may be performed by the image processing system 102 .
- the system illustrated in FIG. 1 shows one example configuration that may be used to implement the functionality of the image processing system 102 and the print engine 104 .
- the print engine 104 comprises a build bed 106 , a movable fluid ejection array 108 , and a moveable curing array 110 .
- the build bed comprises a working area upon which the object is fabricated, and may comprise a substantially flat, planar space.
- the moveable fluid ejection array 108 includes a plurality of fluid ejection modules 112 1 - 112 n (hereinafter collectively referred to as “fluid ejection modules 112 ”), each of which may be controlled by a respective fluid ejection module controller (not shown) that receives electronic signals from the image processing system 102 .
- Each fluid ejection module 112 may include a plurality of fluid ejection devices (e.g., dies, pens, nozzles, or the like) for ejecting printing fluid (e.g., fusing agents, non-fusing agents, detailing agents).
- the fluid ejection devices may be of the type used in high-speed commercial inkjet printing presses.
- first plurality of the fluid ejection devices ejects fusing printing fluids (e.g., fluids that contain a fusing agent that causes a powder to fuse together or solidify when exposed to a quantity of energy), while a second plurality of the fluid ejection devices ejects non-fusing printing fluids (e.g., fluids that contain non-fusing agents that prevent the powder from fully fusing together or solidifying when exposed to the quantity of energy).
- the non-fusing printing fluids may include cooling agents, agents that can chemically or physically prevent or weaken the fusing process, or agents that can break down the fused solid material after fusing.
- the non-fusing printing fluids could also include fluids that react differentially to subsequent finishing processes (e.g., ultrasound, shaking, application of specific gases, etc.).
- a third plurality of the fluid ejection devices may eject a detailing agent.
- the non-fusing printing fluids may additionally serve as detailing agents.
- a thin base layer of material e.g., powder
- the moveable curing array 110 e.g., by the material coater 118
- the moveable fluid ejection array 108 is moved to the appropriate height (e.g., according to the object model) along the y dimension, and then passes across the build bed 106 in a first direction along the x dimension.
- the first layer of printing fluid may comprise both fusing and non-fusing printing fluids as well as detailing agents, according to a first slice image.
- the moveable curing array 110 is then moved to the appropriate height (e.g., according to the object model) along the y dimension, and then passes across the build bed 106 in a second direction (e.g., opposite the first direction) along the z dimension. As the moveable curing array 110 passes across the build bed, it emits energy. Application of the energy to the first layer of printing fluid causes the fusing printing fluids in the first layer of printing fluid to absorb the energy, which in turn causes at least some of the powder to fuse or solidify into a first layer of the object.
- the moveable fluid ejection array 108 and the moveable curing array 110 may make subsequent passes, alternating as in the first pass, and reversing direction each time along the x and z dimensions, respectively. Each pass may also move the height of the moveable fluid ejection array 108 and the moveable curing array 110 higher along the y dimension. These subsequent passes fabricate additional layer of the object, which fuse to the prior layers, until the object is fully fabricated.
- the system 100 illustrates one example of an additive manufacturing system that uses inkjet technology.
- Other additive manufacturing systems may use different types of technology that include additional components, or omit some of the components illustrated in FIG. 1 .
- an additive manufacturing system that uses three-dimensional binder jetting technology may not include any emitters for emitting energy.
- such a system could still use a combination of binding and non-binding printing fluids to disguise an object during fabrication.
- FIG. 2 illustrates a flowchart of an example method 200 for fabricating an object via an additive manufacturing process.
- the method 200 may be performed, for example, by the system 100 illustrated in FIG. 1 .
- the method 200 is not limited to implementation with the system illustrated in FIG. 1 .
- the method 200 begins in block 202 .
- a model is generated (e.g., using the image processing system 102 ) for an item to be fabricated via an additive manufacturing process.
- the model may comprise a plurality of slice images, where each slice image corresponds to one layer of the object to be fabricated.
- each slice image may represent a cross section of the object.
- at least one of the slice images includes a first region and a second region. The first region of the slice image defines a cross section of the object to be fabricated, while the second region of the slice image defines a sacrificial artifact.
- FIG. 3 A illustrates a first example slice image 300 of an object to be fabricated via an additive manufacturing process.
- the slice image 300 comprises a slice or cross section of a model of a gear.
- FIG. 3 B illustrates a second example slice image 302 of the object of FIG. 3 A .
- the shape and dimensions of the gear are obscured or disguised.
- FIG. 3 C illustrates an example ink distribution map 304 corresponding to the second example slice image of FIG. 3 B .
- the second example slice image 302 actually comprises two regions: a first region 306 that defines the slice of the gear and a second region 308 that defines a sacrificial artifact.
- first region 306 and the second region 308 of the ink distribution map 304 are illustrated in different colors, this does not necessarily indicate that the first region 306 and the second region 308 are printed in different color printing fluids. Rather, it is to show the boundaries of the first region 306 and the second region 308 .
- the first region 306 and the second region 308 could be printed in printing fluids of the same color (i.e., printing fluids that are the same color before and after fusing or binding, though the pre-fusing colors of the printing fluids may differ from the post-fusing colors due to processing), as illustrated in the second example slice image 302 , so that they blend seamlessly together (i.e., without any clear visible boundaries).
- the first region 306 is printed or fabricated using a fusing printing fluid, as discussed above, while the second region 308 is printed or fabricated using a non-fusing printing fluid.
- the first region 306 and the second region 308 physically contact each other in order to promote seamless blending of the two regions 306 and 308 .
- the second region 308 at least partially surrounds or encompasses the first region 306 .
- the second region 308 may take any shape, as can the resulting slice image that incorporates both the first region 306 and the second region 308 (e.g., as illustrated in FIG. 3 B ).
- the resulting slice image could take the shape of a bounding polygon, a bounding curve, or even the original slice image with some additional features.
- the object is fabricated via the additive manufacturing process, using a fusing printing fluid to render the object.
- the fusing printing fluid is a printing fluid that absorbs applied energy, which in turn raises the temperature of a powder and causes the powder to fuse together or solidify.
- the sacrificial artifact is fabricated, simultaneously with the object, via the additive manufacturing process.
- the sacrificial artifact is rendered using a non-fusing printing fluid.
- the non-fusing printing fluid is a printing fluid that prevents the powder from fully fusing together or solidifying when exposed to energy.
- the sacrificial artifact could be fabricated using a combination of fusing and non-fusing printing fluids.
- the portions of the sacrificial artifact that are fabricated using fusing printing fluids do not directly physically contact the object.
- the object is fabricated using a fusing printing fluid (e.g., in block 306 ), and the sacrificial artifact comprises a “buffer” portion fabricated using non-fusing printing fluid that directly physically contacts the object. Additional portions of the sacrificial artifact that directly physically contact the buffer portion (without directly physically contacting the first region) are then fabricated using the fusing printing fluid.
- this approach may minimize contamination of the base layer material (e.g., powder) upon which the object is fabricated, thereby allowing for recycling of the base layer material in subsequent additive manufacturing processes.
- the base layer material e.g., powder
- the method 200 ends in block 210 .
- the first region 306 of the ink distribution map 304 would be fabricated using a fusing printing fluid, while the second region 308 of the ink distribution map 304 would be fabricated using a non-fusing printing fluid of the same color as the fusing printing fluid (e.g., as illustrated in FIG. 3 B ).
- Other slices or layers of the object would be rendered in a similar manner.
- the result of the additive manufacturing process would thus be the solid, three-dimensional gear, plus some amount of un-fused powder and printing fluid that does not fuse to the gear.
- the boundaries between the gear and the un-fused amounts of powder and printing fluid would be undetectable to the human eye.
- the object being fabricated may be a multi-colored object.
- fusing and non-fusing printing fluids of multiple colors may be used to disguise the geometry and dimensions of the multi-colored object.
- a purple non-fusing printing fluid may be jetted adjacent to a first portion of the object that is fabricated using purple fusing printing fluid
- an orange non-fusing printing fluid may be jetted adjacent to a second portion of the object that is fabricated using orange fusing printing fluid.
- non-fusing printing fluids on the boundaries of the object being fabricated to improve the aesthetics of the object.
- trace amounts of powder which is typically white or uncolored
- a fusing printing fluid may still fuse to the object boundaries, resulting in discoloration on the boundaries.
- the discoloration can be minimized.
- even relatively large amounts of “contamination” by the powder treated with the non-fusing printing fluid will be undetectable to the human eye.
- the method 200 could be used to fabricate a part for a proprietary project.
- the part may be a standard one, the manufacturer may wish to avoid information inference from the part and may therefore choose to fabricate the part according to the method 200 .
- the method 200 may be used to fabricate a prototype of an animated character whose design is confidential.
- blocks, functions, or operations of the methods 200 described above may include storing, displaying and/or outputting for a particular application.
- any data, records, fields, and/or intermediate results discussed in the method can be stored, displayed, and/or outputted to another device depending on the particular application.
- blocks, functions, or operations in FIG. 2 that recite a determining operation, or involve a decision do not necessarily imply that both branches of the determining operation are practiced.
- FIG. 4 A illustrates an example slice image 400 for use in fabricating a plurality of objects (e.g., gears).
- FIG. 4 B illustrates an example ink distribution map 402 corresponding to the slice image 400 of FIG. 4 A .
- the number of objects (e.g., six gears) being fabricated can be obscured in the slice image 400 by printing a sacrificial artifact that surrounds the objects, using a non-fusing printing fluid of the same color as the fusing printing fluid used to fabricate the objects.
- FIG. 1 Further examples of the present disclosure can be extended in the direction of build (e.g., along the y dimension of FIG. 1 ).
- entire sacrificial layers may be fabricated between adjacent non-sacrificial layers of the object in order to disguise the dimensions and geometry of the object in the y dimension.
- FIG. 5 depicts a high-level block diagram of an example computer that can be transformed into a machine capable of performing the functions described herein. Notably, no computer or machine currently exists that performs the functions as described herein. As a result, the examples of the present disclosure modify the operation and functioning of the general-purpose computer to perform additive manufacturing using fusing and non-fusing printing fluids, as disclosed herein.
- the computer 500 comprises a hardware processor element 502 , e.g., a central processing unit (CPU), a microprocessor, or a multi-core processor, a memory 504 , e.g., random access memory (RAM) and/or read only memory (ROM), a module 505 for performing additive manufacturing using fusing and non-fusing printing fluids, and various input/output devices 506 , e.g., storage devices, including but not limited to, a tape drive, a floppy drive, a hard disk drive or a compact disk drive, a receiver, a transmitter, a speaker, a display, a speech synthesizer, an output port, an input port and a user input device, such as a keyboard, a keypad, a mouse, a microphone, and the like.
- a hardware processor element 502 e.g., a central processing unit (CPU), a microprocessor, or a multi-core processor
- a memory 504 e.g., random
- the general-purpose computer may employ a plurality of processor elements.
- one general-purpose computer is shown in the figure, if the method(s) as discussed above is implemented in a distributed or parallel manner for a particular illustrative example, i.e., the blocks of the above method(s) or the entire method(s) are implemented across multiple or parallel general-purpose computers, then the general-purpose computer of this figure is intended to represent each of those multiple general-purpose computers.
- a hardware processor can be utilized in supporting a virtualized or shared computing environment.
- the virtualized computing environment may support a virtual machine representing computers, servers, or other computing devices.
- hardware components such as hardware processors and computer-readable storage devices may be virtualized or logically represented.
- the present disclosure can be implemented by machine readable instructions and/or in a combination of machine readable instructions and hardware, e.g., using application specific integrated circuits (ASIC), a programmable logic array (PLA), including a field-programmable gate array (FPGA), or a state machine deployed on a hardware device, a general purpose computer or any other hardware equivalents, e.g., computer readable instructions pertaining to the method(s) discussed above can be used to configure a hardware processor to perform the blocks, functions and/or operations of the above disclosed methods.
- ASIC application specific integrated circuits
- PDA programmable logic array
- FPGA field-programmable gate array
- instructions and data for the present module or process 505 for performing additive manufacturing using fusing and non-fusing printing fluids can be loaded into memory 504 and executed by hardware processor element 502 to implement the blocks, functions or operations as discussed above in connection with the method 200 .
- the module 505 may include a plurality of programming code components, including a slice image modification component 508 and an ink distribution mapping component 510 .
- the slice image modification component 508 may be configured to modify a slice image or portion of a model for an object to include a sacrificial artifact. For instance, the slice image modification component 508 may be configured to convert an original slice image for an object, such as the slice image illustrated in FIG. 3 A , to a corresponding disguised slice image that includes both the object and a sacrificial artifact, such as the slice image illustrated in FIG. 3 B .
- the ink distribution mapping component 510 may be configured to generate an ink distribution map for a pass of an additive manufacturing process, based on a slice image that uses both fusing and non-fusing printing fluids. For instance, the ink distribution mapping component 510 may be configured to generate an ink distribution map such as that illustrated in FIG. 3 C .
- a hardware processor executes instructions to perform “operations”, this could include the hardware processor performing the operations directly and/or facilitating, directing, or cooperating with another hardware device or component, e.g., a co-processor and the like, to perform the operations.
- the processor executing the machine readable instructions relating to the above described method(s) can be perceived as a programmed processor or a specialized processor.
- the present module 505 for performing additive manufacturing using fusing and non-fusing printing fluids, including associated data structures, of the present disclosure can be stored on a tangible or physical (broadly non-transitory) computer-readable storage device or medium, e.g., volatile memory, non-volatile memory, ROM memory, RAM memory, magnetic or optical drive, device or diskette and the like.
- the computer-readable storage device may comprise any physical devices that provide the ability to store information such as data and/or instructions to be accessed by a processor or a computing device such as a computer or an application server.
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